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"I think we'll all be pleased when that's passed," he said.

It's not intuitively clear why a presidential election—even as contentious as this one—would cause people to buy fewer cups of coffee and doughnuts in the preceding months. Last year, researchers at Princeton and Chicago found that election uncertainty affects consumers' outlook, but not their immediate spending.

On Friday, the University of Michigan's preliminary consumer confidence survey for October showed that its expectations index fell to the lowest level since August 2014.

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"It is likely that the uncertainty surrounding the presidential election had a negative impact, especially among lower income consumers, and without that added uncertainty, the confidence measures may not have weakened," said Richard Curtin, the survey's chief economist.

Besides, consumer spending is still the biggest driver of economic growth and has held steady at a time when businesses haven't pulled their weight. The most recent estimate of personal consumption in the second quarter was 4.3%, revised down by 0.1 percentage point from the highest level since Q4 2014.

But the election uncertainty is a little more obvious for franchisees.

Dunkin' Brands said Thursday that the number of new U.S. locations it opens this year will be at the low end of its previously provided range of 430-460.

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This was how Travis responded after an analyst asked why (emphasis added):

What is driving franchisees towards the lower end is several factors, and I've described it, put it together as uncertainty, as uncertainty over the general election, Senate, obviously, the House, and local elections.

"And it was interesting earlier this year — and I have a feeling I've said this on an earlier earnings call — I was with some franchisees in one state that I won't name. And I've said to them, look, you're going to open one store this year, why don't you open two? And their response was uncertainty, regulation, we don't know where the minimum wage is going. There was just so much uncertainty.

For franchisees, that wait-and-see caution reflects the divide in both candidates' plans for the economy. For example, Democratic nominee Hillary Clinton has said she wants to raise the national minimum wage to $12 an hour, while Republican nominee Donald Trump would rather let states decide.